Because the extruder starts from the day of production, it has to bear all kinds of dynamic loads. Transmission friction between parts, melt friction, and decomposition of gas corrosion, environmental pollution, and operational errors will all be applied to extruders. Therefore, after a period of time, the performance and efficiency of the equipment will change or drop slightly. Therefore, the maintenance of the extruder is to prolong the service life of the extruder so that the performance and efficiency of the extruder can be kept in a normal state for a long time to provide economic benefits. Inspection and maintenance before production can also detect problems in time and avoid loss of personnel materials in production.